join in
US /dʒɔɪn ɪn/
UK /dʒɔɪn ɪn/

1.
bergabung, ikut serta
participate or become involved in an activity with others
:
•
Everyone was singing, so I decided to join in.
Semua orang bernyanyi, jadi saya memutuskan untuk ikut bergabung.
•
Don't be shy, just join in the game!
Jangan malu, ikut saja permainannya!